We work in the stable homotopy category of spectra (see [1]}, [2]}, [3]}, [4]}, [5]}). Given objects (spectra) \(X\)  and \(Y\) , we denote by \([X, Y]\)  the set of morphisms between them, which is an abelian group, and denote by \(\pi _*(X)\)  the homotopy groups of \(X\) .
